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(No Model.)

A. J. URLIN.- KEY HOLE GUARD.

No. 374,719. Patented Dec. 13, 1887 IN VEN TOR hat Z ATTORNEYS.

UNITED STATES PATENT OFFICE.

ALFRED J. URLIN, OF MISSOULA, MONTANA TERRITORY.

KEY-HOLE GUARD- SPECIFICATION forming part of Letters Patent No. 374,719, dated December 13, 1887.

(No model.)

To'aZZ whom zit may concern.-

Be it known that I, ALFRED J. URLIN, of Missoula, in the county of Missoula, Montana Territory, have invented a new and useful Improvement in Key-Hole Guards for Door-. Locks, of which the following is a specification.

This invention relates to a key-hole guard for covering and obstructing the entrance to the interior mechanism of the look through the key-hole.

The object of my invention is to provide a guard which will cover the key-hole on both sides of the look without interfering with the movement of the key when placed within the lock, which will prevent the key from falling out of the lock, and will also prevent persons from the outer side of the door passing another key or picking-tool into the lock; and the improvement consists in certain peculiarities of construction of parts, hereinafter described, and particularly designated in the claim.

In the accompanying drawings, Figure 1 is an elevation of a lock embodying my invention with the front plate removed, with the key-hole and key shown by dotted lines; Fig. 2, a sectional elevation, enlarged, through the hollow slide-block and through the back and front plates of the lock, showing the key in elevation; and Fig. 3, a perspective of the hol- 10w slide-block detached.

My improvements are shown as applied to an ordinary rectangular door-lock, wherein the lock-case A consists of a back plate, A,'

having a top wall, a, a bottom wall, a, and side walls, a a and of a flat front plate, A, which fits over the back plate with its side walls, and is secured-thereon by a screw,- a", passing centrally through the front plate into a post, (i projecting from the back plate, and

by wood-screws a, passing through both the front and back plates into the door. Alatch, B, and latch-stop B, placed in the upper part of the casing, and a bolt, 0, having atumbler, G, and spring 0 are all of the ordinary construction used in this class of locks and operate in a well-known manner.

D is a slide-block of novel construction, consisting of a hollow shell with side plates, d d, top cross-plate, at, a bottom cross-plate, (1

and a thumb-bit, (2*, projecting from the bottom cross-plate down through a slot, (H, in the bottom wall, a, of the lock-case, by which means the slideblock may be easily moved within the lock-case to bring the side plate d of the block across both the inner key-hole, E, and the side plate (1 across the outer keyhole, E, of the lock.

The upper corners of the slide-block nearest the key-holes are cut out to partly encircle the pin of the key when placed within the lock and permit the bit of the key to pass through or Within the hollow port-ion of the slide-block and turn freely therein to lift the tumblers and throw the bolt in either'direction while the slide-block is in position to guard the key-holes.

The key is by theabove-described means prevented from falling out of the lock or from being removed by children or lneddlesome persons.' Thekey-hole is so obstructed by the slide-block that persons cannot see through it, and cold air, snow, rain, and sound are prevented thereby from passing from one room to another. The key is prevented from being turned in the look from the outside by first moving the slide to open the key-hole, then looking the door and turning the key in the lock until it fills the keyhole, and finally pushing the slide over'the key-hole. The door cannot then be unlocked without first pushing the slide back from over the key-hole, which can'be done from the inside only.

' I claim as my invention and desire to secure ALFRED J. URLIN.

Witnesses:

' H. SWANEY,

.EARNEST WRIGHT. 

